Soldiers from the nations of Bulgaria, Serbia and Romania receive certificates after the completion of Platinum Lion 15 at Novo Selo Training Area, Bulgaria, Jan 26. Platinum Lion was a multi-national exercise with the nations of Bulgaria, Serbia and Romania and Black Sea Rotational Force Marines. - Soldiers from the nations of Bulgaria, Serbia and Romania receive certificates after the completion of Platinum Lion 15 at Novo Selo Training Area, Bulgaria, Jan 26. Platinum Lion was a multi-national exercise with the nations of Bulgaria, Serbia and Romania and Black Sea Rotational Force Marines.